If enthalpy is the heat for a reaction, it must have a sign as well as a magnitude. What sign should the enthalpy for an exothermic reaction have? Why?

What are some similarities between sublimation and deposition?

2. J. J. Thomson's cathode-ray tube experiment showed which of the following? Electrons are in a cloud surrounding positively charged particles. Atoms consist of at least some negatively charged particles. Matter can be neither created nor destroyed.

A glass with a few militers of water is left out on the cabinet what happens next

NH4Cl and Na2SO4 Balanced Equation Total Ionic Equation Net Ionic Equation

Despite the fact that stainless steel is much denser than water the stainless steel razor blade can be made to float on water. Why?

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.

Assign the oxidation number for (NH4) 3PO4

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?

Do pure substances have the same chemical and physical properties

How is matter conserved in a chemical reaction